Created by Joseph Patton, GNB (pronounced jen-buh) is an acronym of the phrase 'good night buddy', used when the speaker is extremely tired. Often, GNB is an indication of exhaustion and weakening concentration.
GNB can be used as a noun, a verb or an adjective.
noun - "GNB is closing in on me."
verb - "I'll GNB now, if you don't mind."
adjective - "I've been feeling so GNB'd today!"